The CAP CER 2.1PF 50V C0G/NP0 0805 is a specific type of ceramic capacitor with the following characteristics: it has a capacitance value of 2.1 pF, a tolerance of ±0.05 pF, and a voltage rating of 50 volts. It adheres to the C0G and NP0 standards (1B) and features a metric case size of 0805 (2012).